353 lines
8.6 KiB
C
353 lines
8.6 KiB
C
/** Includes */
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#define _DEFAULT_SOURCE
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#define _BSD_SOURCE
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#define _GNU_SOURCE
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#include <ctype.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <termios.h>
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#include <unistd.h>
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/** defines */
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#define TTED_VERSION "0.0.1"
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#define CTRL_KEY(k) ((k) & 0x1f)
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enum editorKey {
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ARROW_LEFT = 1000,
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ARROW_RIGHT,
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ARROW_UP,
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ARROW_DOWN,
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DEL_KEY,
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HOME_KEY,
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END_KEY,
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PAGE_UP,
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PAGE_DOWN
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};
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/** data */
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typedef struct erow {
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int size;
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char *chars;
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} erow;
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struct editorConfig {
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int cx, cy;
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int rowoff;
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int screenrows;
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int screencols;
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int numrows;
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erow *row;
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struct termios orig_termios;
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};
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struct editorConfig E;
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/** terminal */
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void die(const char *s) {
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write(STDOUT_FILENO, "\x1b[2J", 4);
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write(STDOUT_FILENO, "\x1b[H", 3);
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perror(s);
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exit(1);
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}
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void disableRawMode() {
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if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &E.orig_termios) == -1) {
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die("tcsetattr");
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}
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}
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void enableRawMode() {
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if (tcgetattr(STDIN_FILENO, &E.orig_termios) == -1) die("tcgetattr");
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atexit(disableRawMode);
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struct termios raw = E.orig_termios;
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raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
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raw.c_oflag &= ~(OPOST);
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raw.c_cflag |= (CS8);
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raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
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raw.c_cc[VMIN] = 0;
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raw.c_cc[VTIME] = 1;
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if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) == -1) die("tcsetattr");
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}
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int editorReadKey() {
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int nread;
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char c;
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while ((nread = read(STDIN_FILENO, &c, 1)) != 1) {
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if (nread == -1 && errno != EAGAIN) die("read");
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}
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if (c == '\x1b') {
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char seq[3];
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if (read(STDIN_FILENO, &seq[0], 1) != 1) return '\x1b';
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if (read(STDIN_FILENO, &seq[1], 1) != 1) return '\x1b';
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if (seq[0] == '[') {
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if (seq[1] >= '0' && seq[1] <= '9') {
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if (read(STDIN_FILENO, &seq[2], 1) != 1) return '\x1b';
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if (seq[2] == '~') {
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switch (seq[1]) {
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case '1':
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return HOME_KEY;
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case '3':
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return DEL_KEY;
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case '4':
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return END_KEY;
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case '5':
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return PAGE_UP;
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case '6':
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return PAGE_DOWN;
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case '7':
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return HOME_KEY;
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case '8':
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return END_KEY;
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}
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}
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} else {
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switch (seq[1]) {
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case 'A':
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return ARROW_UP;
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case 'B':
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return ARROW_DOWN;
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case 'C':
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return ARROW_RIGHT;
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case 'D':
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return ARROW_LEFT;
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case 'H':
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return HOME_KEY;
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case 'F':
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return END_KEY;
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}
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}
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} else if (seq[0] == 'O') {
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switch (seq[1]) {
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case 'H':
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return HOME_KEY;
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case 'F':
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return END_KEY;
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}
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}
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return '\x1b';
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} else {
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return c;
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}
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}
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int getCursorPosition(int *rows, int *cols) {
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char buf[32];
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unsigned int i = 0;
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if (write(STDOUT_FILENO, "\x1b[6n", 4) != 4) return -1;
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while (i < sizeof(buf) - 1) {
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if (read(STDIN_FILENO, &buf[i], 1) != 1) break;
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if (buf[i] == 'R') break;
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i++;
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}
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buf[i] = '\0'; //assign null to final byte
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if (buf[0] != '\x1b' || buf[1] != '[') return -1;
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if (sscanf(&buf[2], "%d;%d", rows, cols) != 2) return -1;
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return 0;
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}
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int getWindowSize(int *rows, int *cols) {
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struct winsize ws;
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if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 || ws.ws_col == 0) {
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if (write(STDOUT_FILENO, "\x1b[999C\x1b[999B", 12) != 12) return -1;
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return getCursorPosition(rows, cols);
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} else {
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*cols = ws.ws_col;
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*rows = ws.ws_row;
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return 0;
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}
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}
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/** Row operations */
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void editorAppendRow(char *s, size_t len) {
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E.row = realloc(E.row, sizeof(erow) * (E.numrows + 1));
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int at = E.numrows;
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E.row[at].size = len;
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E.row[at].chars = malloc(len + 1);
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memcpy(E.row[at].chars, s, len);
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E.row[at].chars[len] = '\0';
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E.numrows++;
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}
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/** file i/o */
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void editorOpen(char *filename) {
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FILE *fp = fopen(filename, "r");
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if (!fp) die("fopen");
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char *line = NULL;
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size_t linecap = 0;
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ssize_t linelen;
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while ((linelen = getline(&line, &linecap, fp)) != -1) {
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while (linelen > 0 && (line[linelen - 1] == '\n' ||
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line[linelen - 1] == '\r'))
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linelen--;
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editorAppendRow(line, linelen);
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}
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free(line);
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fclose(fp);
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}
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/** append buffer */
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struct abuf {
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char *b;
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int len;
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};
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#define ABUF_INIT {NULL, 0}
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void abAppend(struct abuf *ab, const char *s, int len) {
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char *new = realloc(ab->b, ab->len + len);
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if (new == NULL) return;
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memcpy(&new[ab->len], s, len);
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ab->b = new;
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ab->len += len;
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}
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void abFree(struct abuf *ab) {
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free(ab->b);
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}
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/** output */
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void editorDrawRows(struct abuf *ab) {
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int y;
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for (y = 0; y < E.screenrows; y++) {
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if (y >= E.numrows) { // Draw rows after buffer
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if (E.numrows == 0 && y == E.screenrows / 3) {
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char welcome[80];
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int welcomelen = snprintf(welcome, sizeof welcome, "Tyrel Text Editor Deluxe -- version %s",
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TTED_VERSION);
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int padding = (E.screencols - welcomelen) / 2;
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if (padding) {
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abAppend(ab, "~", 1);
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padding--;
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}
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while (padding--) abAppend(ab, " ", 1);
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if (welcomelen > E.screencols) welcomelen = E.screencols;
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abAppend(ab, welcome, welcomelen);
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} else {
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abAppend(ab, "~", 1);
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}
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} else { // draw buffer
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int len = E.row[y].size;
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if (len > E.screencols) len = E.screencols; // truncate if further than columns
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abAppend(ab, E.row[y].chars, len);
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}
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abAppend(ab, "\x1b[K", 3);
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if (y < E.screenrows - 1) {
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abAppend(ab, "\r\n", 2);
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}
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}
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}
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void editorRefreshScreen() {
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struct abuf ab = ABUF_INIT;
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abAppend(&ab, "\x1b[?25l", 6);
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abAppend(&ab, "\x1b[H", 3); // Cursor Position home
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editorDrawRows(&ab);
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char buf[32];
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snprintf(buf, sizeof(buf), "\x1b[%d;%dH", E.cy + 1, E.cx + 1);
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abAppend(&ab, buf, strlen(buf));
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abAppend(&ab, "\x1b[?25h", 6);
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write(STDOUT_FILENO, ab.b, ab.len);
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abFree(&ab);
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}
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/** input */
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void editorMoveCursor(int key) {
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switch (key) {
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case ARROW_LEFT:
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if (E.cx != 0) {
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E.cx--;
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}
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break;
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case ARROW_RIGHT:
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if (E.cx != E.screencols - 1) {
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E.cx++;
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}
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break;
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case ARROW_UP:
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if (E.cy != 0) {
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E.cy--;
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}
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break;
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case ARROW_DOWN:
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if (E.cy != E.screenrows - 1) {
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E.cy++;
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}
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break;
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}
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}
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void editorProcessKeypress() {
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int c = editorReadKey();
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switch (c) {
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case CTRL_KEY('q'):
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write(STDOUT_FILENO, "\x1b[2J", 4);
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write(STDOUT_FILENO, "\x1b[H", 3);
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exit(0);
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break;
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case HOME_KEY:
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E.cx = 0;
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break;
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case END_KEY:
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E.cx = E.screencols - 1;
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break;
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case PAGE_UP:
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case PAGE_DOWN: {
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int times = E.screenrows;
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while (times--)
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editorMoveCursor(c == PAGE_UP ? ARROW_UP : ARROW_DOWN);
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}
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break;
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case ARROW_UP:
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case ARROW_DOWN:
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case ARROW_LEFT:
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case ARROW_RIGHT:
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editorMoveCursor(c);
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break;
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}
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}
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/** init */
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void initEditor() {
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E.cx = 0;
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E.cy = 0;
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E.rowoff = 0;
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E.numrows = 0;
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E.row = NULL;
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if (getWindowSize(&E.screenrows, &E.screencols) == -1) die("getWindowSize");
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}
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int main(int argc, char *argv[]) {
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enableRawMode();
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initEditor();
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if (argc >= 2) {
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editorOpen(argv[1]);
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}
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while (1) {
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editorRefreshScreen();
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editorProcessKeypress();
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}
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return 0;
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}
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